linux-kernel - Re: [PATCH v1] driver core: Use list_del_init to replace list_del at device_links

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Date:   Tue, 14 Jan 2020 15:20:12 +0000
From:   John Garry <john.garry@...wei.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        James Bottomley <jejb@...ux.ibm.com>
CC:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "saravanak@...gle.com" <saravanak@...gle.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v1] driver core: Use list_del_init to replace list_del at
 device_links_purge()

On 14/01/2020 15:07, Greg KH wrote:
> On Wed, Jan 08, 2020 at 05:04:20PM -0800, James Bottomley wrote:
>> On Wed, 2020-01-08 at 17:10 +0000, John Garry wrote:
>>> On 08/01/2020 16:08, John Garry wrote:
>>>> On 08/01/2020 16:01, James Bottomley wrote:
>>>>>>>>      cdev->dev = NULL;
>>>>>>>>              return device_add(&cdev->cdev);
>>>>>>>>          }
>>>>>>>>      }
>>>>>>>>      return -ENODEV;
>>>>>>>> }
>>>>>>>
>>>>>>> The design of the code is simply to remove the link to the
>>>>>>> inserted device which has been removed.
>>>>>>>
>>>>>>> I*think*  this means the calls to device_del and device_add
>>>>>>> are unnecessary and should go.  enclosure_remove_links and
>>>>>>> the put of the enclosed device should be sufficient.
>>>>>>
>>>>>> That would make more sense than trying to "reuse" the device
>>>>>> structure here by tearing it down and adding it back.
>>>>>
>>>>> OK, let's try that.  This should be the patch if someone can try
>>>>> it (I've compile tested it, but the enclosure system is under a
>>>>> heap of stuff in the garage).
>>>>
>>>> I can test it now.
>>>>
>>>
>>> Yeah, that looks to have worked ok. SES disk locate was also fine
>>> after losing and rediscovering the disk.
>>
>> OK, I'll spin up a patch with fixes/reported and tested tags.
> 
> Did this get sent?  I can't seem to find it :(
> 

Yeah, but you were not cc'ed :(

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?h=next-20200114&id=529244bd1afc102ab164429d338d310d5d65e60d

cheers.
John

> .
>